Chuck Liddell Legal Smack Down

Liddell has been going toe-to-toe with his ex Lori Geyer for months -- in an effort to gain custody of their 12-year-old son.

But today in L.A. County Superior Court, the judge came down hard on Liddell -- because in addition to the child support, Liddell was also FINED $2,500 for failing to produce financial documentation requested by the court.

TMZ contacted Liddell's lawyer, who told us Chuck didn't show because "[Lori's] attorney failed to provide notice in an attempt to obtain favorable decision."